Hex #55900b or rgb(85,144,11) in RGB space is the tint of olive. It has hue angle of 86.62 degrees, value = 56 and saturation = 92. #55900b can be obtained by mixing 4 colors: 5 drops of yellow, 1 drop of blue, 5 drops of green, 4 drops of black.
Nearest safe hex - #669900. Below you can see the block with #55900b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55900b to the mixer and play with it.